Ruffwear Polar Trex Dog Boots ( Set of 4 )The Ruffwear Polar Trex dog boots are designed for warmth, traction, and protection in winter conditions. Insulated upper softshell fabric creates breathable, weatherproof warmth in extreme cold and inclement weather. Ruffwear-designed VibramA(R) outsole provides optimum traction on frozen surfaces.Closure system combines hook-and-loop with hardware, cinching around the narrowest part of the dog's leg to provide a secure fit. Pullover stretch gaiter keeps snow out and improves retention by protecting the hook-and-loop ankle closure from the elements.Just as you would with your gear, adjust fit and check tension of boots 15 minutes into your activity and throughout the adventure as needed.